Question about Canon EF 70-200mm f/2.8L USM Lens

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How do I go go to a central focus point vs. having multiple focus points fire? I just got this lens, and don't see that the instruction book came in the box!

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This is done in your camera not with the lens. On most Canons there is a button with a picture of a box with focus points in it. You hold this down whilst turning your main dial (the one you use to change shutter speed) this will cycle through your focus points. On the 40D and most other cameras this button should be at the very right hand top corner of the back of your camera.

Posted on Sep 15, 2009

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Posted on Jan 02, 2017

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Sx40 hs not focusing for all shots


Hi Brian. First you have to narrow the problem down. Is it your camera or the lens that's producing the problems. Can you try a friends' lens on your camera to see if it still malfunctions? if it does then it's your camera body. Alternatively you could try your lens on a friends' camera to see if he gets the same problem.
Are you using all the focussing points? If you are then this might be the problem because the focus points are spread across the viewfinder and if one of the points sees an object that is nearest to the camera, it will focus on that.
Try usng only the centre focus point and use the focus lock to try and get good focus. Hope this helps.

Nov 02, 2013 | Canon PowerShot SX40 HS Digital Camera 2GB...

1 Answer

My shutter won't fire using 18-55 lens, either on Manual, P or Auto mode. It is set to AF. But when lens is set to MF, shutter fires. I tried switching to another lens and shutter is perfectly fine.


I could be that your lens isn't focusing. If the Auto focus can't find something to focus on the shutter won't fire. If you are shooting in low light sometimes it has trouble try shooting something that is well lit. also your auto focus point may be somewhere other than the center. there is a button on the top of your camera that looks like this [ ][ ] [ ] [ ]
More or less that will switch where your focus point is. If you look in the view finder and see a red dot when you push on the shutter button that is your focus point. push the above button until the red dot is in the centre. that may fix your problem.

Jul 26, 2011 | Canon EOS 450D Digital Camera with 18-55...

1 Answer

Hi there, I don't know if it's a problem or not (I can live with it :) ). I just got a Canon EF 50mm f1.8 II lens, and I really love it. But: When I'm using the eye-level viewfinder (and not...


You may just have the left auto focus points selected. You don't say which camera model you have. If on the back of your camera you can see a button with an icon showing 5 small white blocks in a plus sign in a white box press this to select the auto focus points. It should show the available auto focus points and then use the left/right (wheel) button to change the selection

Jul 01, 2011 | Canon EF 50mm f/1.8 II Lens

1 Answer

Blurred subject in middle of photo


I own Rebel XT and Canon 50mm f1.8 MKII lens with plastic mount and noticed many pictures with missed focus, either front or back focusing. Meaning objects slight forward or below the intended subject is in focus. I've sent my body and the lens to Canon for evaluation and thet adjusted my focus sensors on the body. I still have problems and there are many threads related to focusing on this camera with 50mm f1.8 that the sensors on this camera do not do so well with fast lens and prone to missed focus.
Test your camera's focusing ability with a book or magazine where you focus on just one specific line and see if it is truly in focus when you review the picture.

Feb 15, 2009 | Canon Rebel XT / EOS 350D Digital Camera

2 Answers

Canon 40D focussing problem


Yes, I do have the same experience but it happens to be solved using the AI focus mode instead the single shot one. We also have to know that the AA of this camera is stronger than the previous generations of XXD cameras.
For the ones saying about not being as sharp as the point an shot, take into account that you can set the sharpening to be as strong as you want with a limit of 7 degrees of sharpening in camera. (but it only works with jpegs)

Sep 12, 2008 | Canon EOS 40D Digital Camera

1 Answer

Focusing


On most digital cameras you can point at an object centred in the lens and hold the shutter control in slightly, them move the camera to another area with the focus/exposure set. If your camera gets it's focus as an average of multiple points this may be a little tougher.

Regards

Philip

Jul 31, 2008 | Panasonic Lumix DMC-FZ7 Digital Camera

1 Answer

Problem with lens


if you cant afford it read this,
The reason for this is that I find it easiest to track a moving subject if it's in the middle of the viewfinder. Cameras cannot know what you want to focus on, and if you start using multiple AF points, how is the camera supposed to know that you want to focus on the bird and not the tree - cameras are lacking in human thought processes! What is quite handy though is using the AI SERVO FOCUS or AI FOCUS settings so that the lens will alter it's focus on the subject over which the centre AF point is aligned as it moves towards you or further away from you. Without this, the focus will fix at the point you half depress shutter and if the subject comes closer or goes further away then it will be out of focus. you can call any expert of lences also for it if you can afford.

May 22, 2008 | Tamron 70-300mm f/4-5.6 Di Zoom Lens for...

4 Answers

Nikon D80


EXPLANATION.
1. The problem with 18-135 lens is because it make from plastic. Main problem from plastic is it can be reshaped after a few usage. When the shape ran out, the contact point will be defective. When the contact point didnt really touched, the processor cant send signal to lens to do autofocus (the lens focus using the lens motor, not the body). When u set to manual focus, the body doesnt need to instruct the lens to focus.
2. You are focusing something that is to near than the focal point.

SOLUTION.
1.Try cleaning the contact point on the lens. Then mount it back until the F showing up (F= aperture). This solution depend on your luck too. if the gap between to contact is so far, then it might happen back. Usually when u need it badly. haha
2. try to get more distance from your subject. Just keep press the shutter until the camera focus.

CONCLUSION
1.But new lens with metal mounting. It will last and durable.
2.Buy macro lens to close up. normal lens wont focus at short focal point!!~

Oct 08, 2007 | Nikon D80 Digital Camera with 18-135mm...

1 Answer

Cannon Digital Rebel XT


"it no longer takes pictures" i'll need a bit more information from you but for now my first suggestion would be to (if the camera still powers up) try testing the shutter by finding the "sensor clean" option in your menu. (i don't have mine in front of me at the moment, but it's usually one of the last options) first remove the lens and select the sensor clean option. if the shutter opens, then the camera body itslef should be fine. the camera will instruct you how to close the shutter after. be extremely careful when the image sensor is exposed like this, make sure not to touch it and be sure to be in a clean area (dust on your sensor will frustrate you beyond belief) now i've had problem after problem with this standard 18-55mm lens. if the lens can't find a focal point, it won't fire. try switching to manual focus and see if it fires. if while focusing manually there is any resistence or grinding, chances are your lens is shot perhaps from being dropped or there is debris preventing auto focus mode to find a focal point. "i've had my camera for about a year" if you bought it new and have had it under a year, it should still be covered by warrenty and canon will take it back and make repairs (they gave me a new lens when this happened to me)

Apr 08, 2007 | Canon Rebel XT / EOS 350D Digital Camera

1 Answer

S4 No Multiple Focus?


Acceptable focus depends on many things and an appreciation of aperture, lens, distance and shutterspeed is needed before understanding the finer points of 'depth of field' (what will and wont be in focus). Like all cameras, an auto focus camera cannot make everything sharp, it has to focus on one thing, usually in the middle, and the rest of the picture either falls in or out of focus, depending on the combination of the above points. For example, if you shoot on a wide-angle lens with a small aperture, say anything above f8, you should have everything you want in focus. In contrast, on a longer telephoto lens with a wide aperture (more light being allowed to hit the film or chip or whatever) the resulting picture will be sharp within only a few inches of the focus point. This can be really nice if you are shooting single portraits in bright light as the background will become extremely blurry and colourful. I am presuming that the shots you are concerned with had the camera settings set to wide aperture priority, possibly because it was dull or you had a 'sport mode' selected where fast shutterspeed is needed to catch rapid movement thus a wide aperture is needed to compensate and so shallow depth of field results. I don't know the camera you are using or whether you will understand any of the above. If you need a greater explanation of what is essentially a science, please let me know.

Sep 08, 2005 | Pentax Optio S4 Digital Camera

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